---
cve: "CVE-2026-73258"
severity: "MEDIUM"
cvss: 6.5
epss: "0.3%"
vendor: "Cesanta"
kev: false
exploited: false
published: "2026-08-20 17:36:39"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T08:11:41+02:00"
---

# CVE-2026-73258

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can place a lone carriage return or line feed in multipart input processed by mg_http_next_multipart() in src/http.c. The loops comparing s[b] and s[b + 1], and s[h2] and s[h2 + 1], use an incorrect AND condition and stop when either character resembles part of a CRLF terminator. This truncates headers, filenames, or boundaries and can cause an application to accept dangerous content after seeing a misleading Content-Type value. This issue is fixed in version 7.22.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- a9df523f76f43a38bd53b4232b9cfd4c16869e71 (Commit)
- beb73a65a99619ff349c59037ea5197f27c7e533 (Commit)

## Referenzen

- <https://github.com/cesanta/mongoose/security/advisories/GHSA-cc55-8v3r-59p8>
- <https://github.com/cesanta/mongoose/pull/3611>
- <https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71>
- <https://github.com/cesanta/mongoose/releases/tag/7.22>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73258) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_